[Intel-gfx] Mouse cursor disappearing with SNA rendering

[Chris Wilson]

On Fri, Jun 17, 2016 at 06:12:16PM +0800, Daniel J Blueman wrote:
> On 17 June 2016 at 17:18, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > On Fri, Jun 17, 2016 at 05:08:55PM +0800, Daniel J Blueman wrote:
> >> Hi all!
> >>
> >> When unlocking from lightdm, the mouse cursor isn't visible until
> >> switching VTs. This doesn't occur when using UXA rendering mode
> >> though, and affects a *lot* of people [1]. It occurs with a range of
> >> kernels including 4.6.2.
> >>
> >> I'm using xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
> >> (current in Ubuntu 16.04 LTS).
> >>
> >> How can I approach debugging it?
> >
> > Start with a kernel from about 3.19. The trigger was introduced by
> > xorg-server-1.18.3 which double applied a SETCURSOR ioctl. That should
> > have been a noop...
> 
> Thanks for replying Chris!
> 
> I find the issue occurs in kernels 4.6.2, 4.4.13 and 4.3.6, but does
> not in 4.2.8 or 4.1.26, however I also see that locking the screen
> doesn't blank it, so there is behavioural difference also.
> 
> This may result in a kernel bisect tripping on a large merge; I can
> take a look if you think the odds are ok?

I would look at -nightly first and hope that is has been fixed (and that
the fix is trivial).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre